Senior QA Automation Engineer

Overview We are seeking a detail-oriented and proactive QA Automation Engineer to join our team. This role is responsible for ensuring the quality, reliability, and performance of our applications through a combination of manual and automated testing across front-end and back-end systems. The ideal candidate is passionate about software quality, enjoys working in a collaborative environment, and is motivated to improve testing processes, tools, and automation coverage. About Nucleus Security Nucleus Security is transforming how security and development teams manage vulnerabilities at a scale. Our platform unifies vulnerability data across scanners and environments, enabling organizations to prioritize and remediate vulnerabilities efficiently. Through our integrations, we empower customers to ingest data from their existing tools with minimal setup and maximum reliability. Core Responsibilities What You Will Do Ensure the quality and reliability of assigned products across the full stack — UI, APIs, and data — defining test approach and risk coverage with the QA Manager, and leveraging AI tools to improve coverage and efficiency Build, extend, and improve scalable automation frameworks in Selenium and Playwright that the team relies on, reducing manual testing effort and increasing confidence in every release Act as a quality advocate within the team — reviewing test code, sharing testing practices with peers, and raising design concerns early enough to prevent defects rather than catch them Testing & Quality Assurance Plan and execute test coverage for complex, cross-system features, including functional, regression, smoke, integration, and end-to-end testing Design and execute manual and automated test cases covering functionality, performance, and reliability, including positive, negative, and edge cases Assess risk and prioritize testing effort, making clear recommendations on depth of coverage versus delivery timelines Map test cases to business requirements an